Metallic-filament lamp.



K. FARKAS.

METALLIC FILAMENT LAMP.

APPLICATION FILED NOV. 18, 1915.

Patented Dec. 12. 1916.

vawi'oz near. rannas; or new roan, n. r, assrenon or ONE-HALF 'ro earl-mien. LISLE, or raovinnncn, anonn IsLan'n.

METALLIC-FILAMENT LAMP.

To all whom it may concern Be it known that I, KARL EARKAS, a citizen of the Kingdom of Hungary, and a resident at present of New York, county and State of New York, have invented certain new and useful Improvements in Metallic- Filament Lamps, of which the following is a specification.

This invention has reference to a novel incandescent electric reflector lamp with metallic filament, preferably a concentrated metallic filament.

It is the special purpose of the present invention to produce a novel reflector lamp which is provided with a reflector within the incandescing filament. This reflector preferably is circular in shape and directly connected to the stem of the lamp. The circular reflector may directly be provided with the necessary anchors for supportin especially a concentrated filament. If-t is construction is used the anchors, necessary for supporting the filament, especially -a concentrated filament, are directly secured to the reflector. In most instances I prefer to employ a reflector made of glass in form of a bulb which is silvered on the inside. If the anchors are applied to such reflector, then they are fused into the glass before the bulb is silvered. The anchors also may be provided on the stem or the lower ortion of the neck of the glass bulb. The filament is so mounted that it is beyond the reflector which latter thus is within the same preferably approximatel in its central plane.

In order to ren er the present invention entirely clear reference is had to the accompanying drawing in which:

Figure 1 represents 1n perspective view an incandescent electric lamp provided with a concentrated metallic filament and a globular reflector within the same. Fig. 2, is a partial side elevation of the lamp, partly broken away. Fig. 3, is a partial side elevation of a modified form of lamp showing the anchors in a different location from those shown in Fig. 1.

Similar'characters of reference denote like parts in all the figures.

In the drawing (1 represents the lamp globe, b is the stem carrying the leads 0, cl, which connect with the filament supports 6, f. The lamp is mounted in a socket g as usual. 1F i'om the center of the stem a glass flector; l p 7 By employing a globular reflector which Specification of Letters Patent. Patagnttqgdl D m, 112 11mm, Application filed November 18, 1915. Serial no. 62,147.

. forms the reflector, then the same is provided with a short neck 7' which may be di rectly fused to the supporting glass rod it.

By fusing the reflector neck to the glass rod, a partial vacuum is created Within the globe which is hermetically closed confining the remaining air therein. If desired the neck of the glass globe may have .a small opening establishing communication with theinterior so that a vacuumis created within the reflector when the same forms part of a vacuum lamp. However if a nitrogen lamp is provided with such reflector the nitrogen will be in the interior of the globe in the same tensity as in the entire lamp.

In Fig. 2 of the drawing the reflector globe is partly broken away to show its inner silvered surface. A small opening Z is provided in the neck of the globular reflector which establishes communication with its interior, as hereinbefore stated.

The modified form of lamp illustrated in Fig. 3 is of substantially the same construction as the lamps shown in Figs. 1 and 2,

except to note that the anchors m are shown to be fused into the neck of the globular'rehas a spherical surface the light emitted by the incandescent filament is radially reflected in all directions whereby a uniform distribution of the same is effected. In this manner the-filament appears in the form of an incandescent globe which is a beautiful effect. While by the reflectors usually employed the light is thrown in a certain direction the light emitted by the lamp provided with a globular reflector is radially and uni-' formly distributed in all directions.

Iclaim as my invention: A metallic filament nitrogen lamp cornprising an inner supporting glass rod, a hollow globular glass reflector with a short neck 1 secured to the inner end of the said rod and having a small opening in the said neck to establish uniform tensity of nitrogen Within the reflector and globe, a concentrated mei tallic filament beyond the reflector and a plurality of filamentsupporting anchors secured to the said reflector.

Signed at New York N. Y., this l'f th (lay of November, 1915.

KARL FARKAS.

Witnesses:

LILLEY E. SCHMIDT, SOPHIE GRIB. 

